Photo taken on Dec. 4, 2017 shows a watchtower site on the Guangwu Great Wall section built during the Ming Dynasty (1368-1644) in Shanyin County, north China's Shanxi Province. (Xinhua/Zhan Yan)
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Photo taken on Dec. 4, 2017 shows a watchtower site on the Guangwu Great Wall section built during the Ming Dynasty (1368-1644) in Shanyin County, north China's Shanxi Province. (Xinhua/Zhan Yan)
